Nucleophilic aromatic substitution on 1-alkoxy-2-nitronaphthalene by 1-naphthyl Grignard reagents for the synthesis of 2-nitro-1,1′-binaphthyls
                                
                                    
                                        作者:Tetsutaro Hattori、Ayanobu Takeda、Osamu Yamabe、Sotaro Miyano                                    
                                    
                                        DOI:10.1016/s0040-4020(01)01143-7
                                    
                                    
                                        日期:2002.1
                                    
                                    Treatment of 1-methoxy-2-nitronaphthalene with 1-naphthyl- and 2-methoxy-1-naphthylmagnesium bromide in diethyl ether-benzene at room temperature provides a facile entry to the corresponding 2-nitro-1, 1'-binaphthyls in high yields. Induction of axial chirality into the binaphthyl bond has been achieved by using 1-menthoxy-2-nitronaphthalene as the substrate, giving 2-methoxy-2'-nitro-1, 1'-binaphthyl of 78% ee. Also reported is the optical resolution of 2-amino-1,1'-binaphthyls, which can be easily prepared by reduction of the 2-nitro-1,1'-binaphthyls, by preparative LC on a cellulose-derived chiral stationary phase, or on silica gel after conversion into the diastereomeric menthyl carbamates. (C) 2002 Elsevier Science Ltd. All rights reserved.